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مواد دانه درشت
As an example, the heat capacity of sintered alumina with a grain size of 20 nm, compared to a coarse-grained material, is shown in Figure 7.5.
In both cases, the heat capacity for nanocrystalline is greater than for coarse-grained material.
For comparison, the melting temperature of coarse-grained material is indicated in both graphs.
Hence, the saturation magnetization expected would be only 40% of the theoretically possible value found with coarse-grained materials.
Here, the advantage of applying nanoparticles instead of coarse-grained material is clearly visible.
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